3491687189 has 4 divisors (see below), whose sum is σ = 3492035820. Its totient is φ = 3491338560.

The previous prime is 3491687179. The next prime is 3491687191. The reversal of 3491687189 is 9817861943.

3491687189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9817861943 = 193 ⋅50869751.

It can be written as a sum of positive squares in 2 ways, for example, as 2763604900 + 728082289 = 52570^2 + 26983^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3491687189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3491687149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158834 + ... + 179475.

It is an arithmetic number, because the mean of its divisors is an integer number (873008955).

Almost surely, 2^3491687189 is an apocalyptic number.

It is an amenable number.

3491687189 is a deficient number, since it is larger than the sum of its proper divisors (348631).

3491687189 is a wasteful number, since it uses less digits than its factorization.

3491687189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348630.

The product of its digits is 2612736, while the sum is 56.

The square root of 3491687189 is about 59090.4999894230. The cubic root of 3491687189 is about 1517.0915049338.

The spelling of 3491687189 in words is "three billion, four hundred ninety-one million, six hundred eighty-seven thousand, one hundred eighty-nine".